extern void long_delay(void);						// 長延時
extern void short_delay(void);                                          // 短暫延時
extern void delay10ms(unsigned char);
extern void write7279(unsigned char, unsigned char,unsigned char);// 發送一個字節	// 寫入到HD7279

extern unsigned char read7279(unsigned char);			// 從HD7279讀出
extern void send_byte(unsigned char,unsigned char);
extern unsigned char receive_byte(void);